Study On Bus Priority Method Of Single Inters-ection Based On Vehicle-Road-Integration

With the development of the economic and urban modernization, the road congestion problems constraining the sustainable development of cities. Development of intelligent transportation systems (particularly those intelligent transportation systems based on the carriageway collaborative), to improve their level of service, to alleviate the urban traffic congestion brings huge pressure has important significance.Bus signal priority is one of the key technical means to improve servicelevel of the public transport system, however, is limited by factors of data collection technology, data is through the "detector �' signal control system," the one-way transmission, most previous studies have assuming the travel speed of bus is subject to certain distribution or fixed as input value of the control model of the system, but because of the saturation of traffic signals and other traffic conditions, the input conditions are consistent with the actual situation is difficult, leading to the efficiency of model decreases, thereby reducing the effectiveness of the control system.With advances in data detection technology, collaborative road car technology has been further developed, which is between the smart car unit and the intelligent roadside unit provides two-way, real-time information exchange environment, designed to further achieve optimal coordination between the carriage way, improve traffic efficiency and safety. On this basis, the paper in a single intersection level, to design bus priority control strategy based on the coordinated control of speed guide and signal timing, by exchanging information between the carriageway and guide timely arrival of buses, thus make bus travel speed from the control model inputs into outputs, play control model maximum efficiency.First, design a framework for RFID-based vehicle electronic tag bus signal priority control system. Focus on the constituent elements of RFID technology with existing bus signal control system integration and application, to analysis constituent elements of system、structural systems and data and information interactively, on this basis, we propose works and optimize processes of the system.Secondly, design the bus priority approach of speed guide and signal timing cooperative control. In the priority control method thought, focuses on the arrival time window of the bus and the transit time window of the bus, and the establishment of cooperative control rule corresponding speed guide and signal timing.Again, in a single intersection level, respectively, single and multi-boot of the vehicle to guide the vehicle as a research target, establish control model. Combined with delays prediction model and number of stops prediction model, to propose optimization of integrated model of the optimize of bus speed and signal timing, the model output signal timing plans and reach the traffic fow that is driving speed of the bus.Finally, The proposed optimization model for the simulation experiment.Compared with conventional induction control model analysis, the simulation results show that compared sensor control model, control effectiveness of this article control model is much higher, which achieves the speed of the bus travel speed from the input control model to change the model output, maximize model execution efficiency, reached the target buses priority at traffic intersections, and laid the theoretical foundation for further enhancing public transportation system operator services.